Momennia, MehrabRamírez Romero, CupatitzioMomennia, Mehrab; 0000-0002-6184-240XRamírez Romero, Cupatitzio; 0000-0001-9864-010XMartínez Valera, Diego Armando2024-06-262024-06-262024-03https://hdl.handle.net/20.500.12371/20819"In this thesis, we obtain an expression for the total frequency shift (hereafter called total observational frequency shift, since it refers to the frequency shift obtained from observable data of astrophysical systems) of photons emitted by massive particles in geodesic motion circularly orbiting a black hole in a general spherically symmetric background. Our general relations are presented in terms of the metric components and their derivatives that characterize the black hole parameters. As a concrete example of this general relativistic approach, a special case is studied by applying the formalism to a nonsingular black hole conformally related to the Schwarzchild solution that possesses a length scale parameter l and an integer parameter N in addition to the black hole mass. Besides, we express the nonsingular black hole mass in terms of the observational redshift/blueshift. Finally, we investigate the effects of the free parameters of the conformal gravity theory on the observational frequency shift and compare results with those of the standard Schwarzschild black hole".pdfengCIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRAAgujeros negros (Astronomía)--InvestigaciónPartículas (Física nuclear)Fotones--DispersiónDesplazamiento hacia el rojo--InvestigaciónTesis de licenciaturaopenAccess